Alert archive / Wyoming / Special Weather Statements in 2009
Special Weather Statement, NWS Riverton, WY
NWS Riverton, WY issued this special weather statement at Aug 8, 2009, 3:01 AM MDT. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2009, 3:01 AM MDT (09:01 UTC)
- Expired
- Aug 8, 2009, 3:45 AM MDT
- In force
- 44 min
- Issued by
- NWS Riverton, WY
The radar
The Riverton/Lander radar (KRIW), 86 km from the middle of the area, began a volume at 09:03 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 9.0 hours before the alert went out and 80 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 4120 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Riverton, WY wrote its last area forecast discussion before this special weather statement went out at Aug 8, 2:53 AM MDT, 8 minutes earlier.
Area forecast discussion, Aug 8, 2:53 AM MDT, 8 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 652 PM MDT FRI AUG 7 2009 WYZ001>020-022>030-081200- ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST- BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS- NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN- NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS- ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES- SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN- SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY- TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN- WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- YELLOWSTONE NATIONAL PARK- 652 PM MDT FRI AUG 7 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED ACROSS WESTERN AND CENTRAL WYOMING THIS EVENING AND OVERNIGHT. SOME THUNDERSTORMS MAY BE STRONG IN NORTHERN WYOMING...WITH GUSTY WIND TO 45 MPH...SMALL HAIL AND BRIEF HEAVY RAIN. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY AN UNSTABLE AIRMASS OVER THE REGION SATURDAY WILL ALLOW FOR A CONTINUED CHANCE OF SHOWERS AND THUNDERSTORMS. COOLER AND DRIER AIR WILL FOLLOW SUNDAY. SNOW IS ALSO EXPECTED OVER THE NORTHWEST MOUNTAINS FRIDAY NIGHT AND SATURDAY WITH THE SNOW LEVEL BETWEEN 8500 AND 9500 FEET. SEVERAL INCHES OF SNOW IS EXPECTED ABOVE 9000 TO 10000 FEET. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ASKED TO REPORT HAIL AND WIND GUSTS IN EXCESS OF 40 MPH FROM THUNDERSTORMS. THANK YOU. TEAM RIVERTON
In the hours before
Special weather statement, Aug 8, 1:02 AM MDT, 1 hour 59 minutes before
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</html>Special weather statement, Aug 8, 2:06 AM MDT, 55 minutes before
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</html>Local storm report, Aug 8, 2:34 AM MDT, 27 minutes before
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</html>Special weather statement, Aug 8, 3:01 AM MDT, 0 minutes before
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</html>The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 10:09 PM MDT | Special Weather Statement | RIW | Johnson | 36 min |
| Aug 7, 10:17 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 58 min |
| Aug 7, 10:28 PM MDT | Tornado Warning | RIW | Johnson | 49 min |
| Aug 7, 11:01 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 44 min |
| Aug 7, 11:40 PM MDT | Special Weather Statement | RIW | Natrona | 65 min |
| Aug 7, 11:45 PM MDT | Special Weather Statement | RIW | Johnson | 45 min |
| Aug 8, 12:39 AM MDT | Special Weather Statement | RIW | Johnson | 51 min |
| Aug 8, 1:18 AM MDT | Severe Thunderstorm Warning | RIW | Johnson | 42 min |
| Aug 8, 2:06 AM MDT | Special Weather Statement | RIW | 39 min | |
| Aug 8, 2:18 AM MDT | Severe Thunderstorm Warning | RIW | Natrona | 42 min |
| Aug 8, 2:24 AM MDT | Severe Thunderstorm Warning | RIW | Fremont | 37 min |
| Aug 8, 2:34 AM MDT | Severe Thunderstorm Warning | RIW | Natrona | 26 min |
| Aug 8, 3:08 AM MDT | Special Weather Statement | RIW | Washakie | 52 min |
| Aug 8, 4:09 AM MDT | Special Weather Statement | RIW | Natrona | 66 min |
| Aug 8, 5:05 AM MDT | Special Weather Statement | RIW | 40 min | |
| Aug 8, 11:52 AM MDT | Special Weather Statement | RIW | 53 min | |
| Aug 8, 12:09 PM MDT | Special Weather Statement | RIW | Washakie | 51 min |
| Aug 8, 12:53 PM MDT | Special Weather Statement | RIW | Washakie | 37 min |
| Aug 8, 1:40 PM MDT | Special Weather Statement | RIW | Johnson | 50 min |
| Aug 8, 1:59 PM MDT | Special Weather Statement | RIW | Natrona | 46 min |
| Aug 8, 2:31 PM MDT | Special Weather Statement | RIW | Big Horn | 44 min |
| Aug 8, 2:38 PM MDT | Special Weather Statement | RIW | Natrona | 52 min |
| Aug 8, 2:46 PM MDT | Special Weather Statement | RIW | Johnson | 44 min |
| Aug 8, 2:49 PM MDT | Special Weather Statement | RIW | Big Horn | 41 min |
| Aug 8, 3:01 PM MDT | Special Weather Statement | RIW | Big Horn | 44 min |
| Aug 8, 3:24 PM MDT | Special Weather Statement | RIW | Fremont | 51 min |
| Aug 8, 3:37 PM MDT | Special Weather Statement | RIW | Natrona | 38 min |
| Aug 8, 4:49 PM MDT | Special Weather Statement | RIW | Hot Springs | 26 min |
Nearby
Special Weather Statements in Wyoming, 2009Every special weather statement in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.